common mistakes Flashcards
define relative atomic mass
the mass of an isotope of an element compared to 1/12th of a carbon atom
graphite bonding / structure ?
giant covalent lattice
layers free to slide
because of free electrons and weak intermolecular forces
define covalent bond
shared pair of electrons
trigonal pyramidal?
3 bonded 1 lone
lone repels more than bonded
reduces angle by 2.5 degrees
what do bases do
accept protons
chlorine + sodium hydroxide
Cl2 + 2NaOH —> NaCl + NaClO + H2O
why does magnesium have a higher melting point than sodium?
higher charge
more delocalised electrons
stronger attraction between +ve ions and e-
difference between sodium and chlorine
s8 cl2 s has more e- more london forces more energy
why does atomic radius decrease along periods?
more protons
more electrons in outer shell
more attraction / pull
less radius
